The world best performance for racewalking was done by Thiery Toutain on 9/29/96 in Hericourt, France. He completed the distance in 3:40:57, which is faster than most people can run it.

The 50K is also the shortest distance that can be called an
ultramarathon by runners, although it can be run as a slightly longer marathon. (A marathon is 26.2 miles.)

The best performanceon the road was done on 4/2/1988 by South African Thompson Magawane in 2:43:38, which is seriously kicking some ass. That's fast enough to win some regular road marathons. Just a little off the pace is Great Britain's Jeff Norman's 6/7/1980 track best of 2:48:06.